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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f972e3116982e851b2106aa7c0c8ec187d3b5f9e340ba4ad8f59db114d15a40b' 
  AND token = '417rRV1huFVWcw8wwFgkFE1ZqAYNgL/0ejuFv2vaCKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}